Dresser for an abrasive wheel



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DREssER FOR AN ABRASIVE WHEEL Filed June 5, 1962 5 sheets-sheet 2 'Staffa Kiefer/vara, i ,Burmeister jammer April 14, 1964- Filed June 5, 1962 FEE-5 a DRESSER .FOR AN ABRASIVE WHEEL 5 Sheets-Sheet 5 sione, ,/l/ermafz,

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DRESSER FOR AN ABRASIVE WHEEL Filed ,June 5, 1962 FLE -5 5 Sheets-Sheet 4' April 14, 1964 R. s. KlRwlN 3,128,754

DRESSER FOR AN ABRASIVE WHEEL Filed June 5, 1962 5 Sheets-Sheet 5- 1 -lE-.J

Same, Maf-mm, yrmezstr jammer /orfregs United States Patent Ofi tice 3,128,754 Patented Apr. 14, 1964 3,128,754 DRESSER FR AN ABRASIVE WHEEL Ralph S. Kirwin, 245 N. Main St., Crystal Lake, Ill. Filed .lune 5, 1962, Ser. No. 200,081 9 Claims. (Cl. 12S-11) The present invention relates generally to surface wheel grinders, and particularly to the combination of such grinders and devices for shaping the surface of the wheel generally referred to as wheel dressers.

Surface grinders are well known machines for shaping metal and other objects, and conventionally comprise an abrasive wheel which is rotatably mounted on a shaft driven by a motor. The peripheral surface of the abrasive wheel may either be at or shaped depending upon the ultimate shape desired of the work piece. A wheel dresser is a device for shaping the peripheral surface to produce the desired contour for the work piece. A wheel dresser may either provide the abrasive wheel with a cylindrical surface coaxially disposed about the shaft of the wheel, or the wheel dresser may shape the peripheral surface to a curved or angular contour which is still coaxial about the shaft.

Most wheel dessers use a diamond cutter for the purpose of shaping the peripheral surface of an abrasive wheel, and the position of the diamond cutter is controlled either in accordance with a geometric curve generator, or in accordance with a template which is used to guide the position of the cutter. Conventionally, the wheel dresser is attached to the grinder for the purpose of dressing or shaping the peripheral surface of the abrasive wheel, and thereafter removed from the grinder. When it again becomes necessary to reshape the peripheral surface of the grinding Wheel, it is necessary to again realign the wheel dresser on the grinder.

It is an object of the present invention to provide a combination grinder and wheel dresser in which the wheel dresser remains assembled on the grinder during production operations as well as during the process of shaping the wheel with the Wheel dresser.

Prior to the present invention, wheel dressers have been used and known which utilize a cutter controlled by a template. Other wheel dressers have been known which utilize a geometric control mechanism for positioning a cutter. It is an object of the present invention to provide a wheel dresser which utilizes a cutter controlled by both a template and a device for generating geometric positions.

It is also an object of the present invention to provide a wheel dresser which has a cutter Whose position is controlled by means of removable gage blocks. During production operations, the removable blocks may be removed from the wheel dresser to prevent contact of abrasive with the blocks, but the -gage blocks may be utilized for dressing or redressing the grinding wheel.

It is a further object of the present invention to provide a wheel dresser for a grinder with increased accuracy, increased versatility, capable of greater production, and inherently operating with reduced Wear as compared with the wheel dressers known prior hereto.

These objects and advantages, and additional objects and advantages, will become more fully appreciated and understood from a further consideration of this specification, particularly when viewed in the light of the drawings, which illustrate a preferred construction of the present invention, and in which:

FIGURE 1 is a front elevational view of a grinder and wheel dresser constructed according to the teachings of the present invention;

FIGURE 2 is a top view of the wheel dresser taken along the line 2 2 of FIGURE l;

FIGURE 3 is a vertical sectional view of the combination Wheel dresser and grinder taken along the line 3 3 of FIGURE 1;

FIGURE 4 is a horizontal sectional view taken along the line 4 4 of FIGURE 1;

FIGURE 5 is a vertical sectional view taken along the line 5 5 of FIGURE 4;

FIGURE 6 is a fragmentary vertical sectional view taken along the line 6 6 of FIGURE 4;

FIGURE 7 is a fragmentary sectional View taken along the line 7 7 of FIGURE 2;

FIGURE 8 is a horizontal fragmentary sectional View taken along the line 8 8 of FIGURE l;

FIGURE 9 is a perspective view of another cutter and carriage therefor used in the Wheel dresser illustrated in FIGURES 1 through 8, the view taken along the line 9 9 of FIG. 2; and

FIGURE 1,0 is a schematic diagram illustrating the range of movements of the cutting head within the control of the wheel dresser.

Referring to FIGS. l and 2, the numeral 10 generally designates a grinder with an abrasive wheel 12. The wheel 12 has an exterior or peripheral surface 14 which engages a work piece and which is dressed or shaped by the surface wheel dresser generally indicated at 16. The wheel 12 is mounted on a shaft 18 and secured on the shaft 18 by means of a nut 20 which engages threads 22 at the end of the shaft 18. The shaft 18 extends from a quill 24 which has a cylindrical exterior surface 26 and an axial channel 28 extending therethrough. The shaft 18 is mounted on a pair of ball bearings 30 disposed Within the channel 28, and the shaft is coupled at its end opposite the wheel 12 to a motor (not shown) such as an electric motor. A wheel guard 32 is mounted on the quill 24 and extends about a portion of the wheel 12 to protect an operator from flying particles of abrasive and metal in the conventional manner.

The surface wheel dresser 16 is mounted on the quill 24 of the grinder 1l). The surface wheel dresser 16 has a support member 34 with a collar 36 at one end thereof which engages the cylindrical surface 26 of the quill 24. The collar 36 has a generally cylindrical inner surface 38 which engages the surface 26 of the quill, and the collar 36 has a slot 40 disposed on a radial plane of the shaft 18 and on the opposite side of the shaft from the support member 34. A pair of bolts 42 are disposed. within threaded bores 44 located in the surface of the collar confronting one side of the slot 40 and openings 46 aligned with the bores 44 on the other side of the slot 40 of the collar 36. The bolts 42 are provided with heads 48 which are disposed within indentations 50 in the collar 36 so that the screws 42 may tighten the two portions of the collar together on the quill 24.

The dresser 16 has a cutter 52 which is mounted on a vertical shaft 54 which depends from a geometric curve generator, generally indicated at 56. The geometric curve generator 56 is mounted on the support member 34 through a rst track 58 and a first slide 60 which are translatable in a horizontal plane normal to the axis` of the shaft 18, and a second track 62 and slide 64 which are also translatable in a horizontal plane, but parallel to the axis of the shaft 68. The cutter 52 may be moved across the surface 14 of the wheel 12 by translation of the second slide 64 within the second track 62, and the cutter 52 is fed toward or away from the shaft 18 by translation of the rst slide 60 within the rst track 58.

As best illustrated in FIGURE 3, the support member 34. terminates in a flat horizontal surface 66 above the quill 24, and the rst track 58 is mounted on this surface 66 and is rigidly secured to the support member 34. The rst track 58 has a pair of walls 68 and 70 at its opposite edges disposed normal to the shaft 18, and a pair of plates 72 and 74 mounted on the walls 68 and 70 to form a guide for the first slide 60 which is disposed within the slot formed by the walls 68 and 70 and the plates 72 and 74. The slide 60 has a hollow stem 76 extending vertically from the track 58, and a shaft 78 is rotatably disposed within the stem 76. A wheel 80 is mounted on the end of the shaft 78 remote from the track 58, and the shaft 78 is provided with gear teeth 82 at its opposite end. The gear teeth 82 of the shaft 78 are disposed within a slot 84 located centrally between the walls 68 and 70 of the track 58, the slot 84 extending normal to the shaft 18, and the gear teeth 82 of the shaft 78 engage mating gear teeth which extend from one of the sides 86 of the slot 84. In this manner, rotation of the wheel 80 causes the slide 60 to be translated Within the track 58 in a direction normal to the shaft 18 and in a horizontal plane.

The first slide 60 has a vertical surface 88 which carries the second track 62, the second track being secured on the surface 88. The surface 88 of the first slide 60 is reinforced by ribs 90. The second track 62, as illustrated in FIGURE 1, has a pair of horizontal walls 92 and 94 which extend therefrom and support a pair of plates 96 and 98. The second slide 64 has an outwardly extending flange from each side thereof designated 100 which is slidably disposed between the plates 96 and 98 and the walls 92 and 94 of the second track 62. The second track 62 is also provided with a slot 102 which is horizontally disposed and parallel to the axis of the shaft 18, and the slot 102 has protruding teeth extending inwardly from a linear side 104 thereof. A second wheel 106 is mounted on the end of a second shaft 108, and the shaft 108 has gear teeth 110 on its opposite end which engages the rack teeth of the slot 102. The second 'shaft 108 is disposed perpendicular to the second track 62, and rotation of the second wheel 106 translates the second slide 64 in a direction parallel to the axis of the shaft 18.

The slide 64 has a hub 112 at its end confronting the grinder 10, and this hub 112 carries the geometric curve generator 56, as best illustrated in FIGURE 2.

The details of the geometric curve generator 56 are illustrated in FIGURES 4, and 6. The hub 112 has a The fourth track 150 has a bore 150 extending therein normal to the direction of translation of the fourth slide relative to the fourth track. A shaft 162 is journaled within the bore 160, and has a knob 164 mounted on the end thereof remote from the fourth track 150. The end of the fourth shaft 162 opposite the knob 164 terminates in a plurality of protruding gear teeth 166 which extend thereabout. The gear teeth 166 engage the teeth of a track 168 mounted on the fourth slide 144. The shaft 54 which carries the cutter 52 is mounted on the fourth track 150.

Rotation of the wheel 120 results in rotation of the disc 122 relative to the hub 112. The hub 112 carries a scale 170 which confronts the periphery of the disc 122. The disc 122 is graduated in degrees, as illustrated in FIGURE 1, so that the marker on the scale 170 permits the rotational position of the disc 122 to be interpreted. The scale 170 is mounted on the end of an arm'172 which extends from the hub.

The disc 122 is provided with a circular slot 174 which extends adjacent to the periphery of the disc 122. The slot 174 has an inner portion 176 and a narrow mouth portion 178, so that it has a T-shaped cross section. A bore 180 extends through the arm 172 normal to the disc 122, and a locking bolt 182 is disposed within the bore 180. The locking bolt has a head 184 disposed within the circular slot 174 and a nut 186 at its end opposite the disc 122. A spacer 188 is disposed between the arm 172 and the disc 122. In this manner, tightening up on the nut 186 causes the head 184 of the bolt 182 to clamp the spacer 188 between the arm 172 and the disc 122 to retain the disc in a fixed rotational position.

A pair of Vernier adjusting devices 190 and 192 are l disposed at opposite sides of the arm 172 and mounted pair of taper roller hearing assemblies 114 and 116 located at opposite ends thereof, and a spindle or sleeve 118 is journaled within the taper roller bearing assemblies 114 and 116 vertically. A wheel 120 is mounted on the end of the sleeve 118 above the hub 112 and secured to the sleeve.

The sleeve 118 terminates below the hub 112 and carries i thereon a disc 122 which is rotatable with the sleeve 118. The disc 122 has mounted thereon a third slide 124 which extends across the center of the disc 122 and is anchored in position by four bolts 126. The third slide 124 has a pair of anges 128 which extend outwardly from opposite sides thereof, and a third track 130 slidably engages the third slide 124. The third slide 124 has a central opening 132, and a shaft 134 is journaled within the opening 132 and exteneds into a slot 136 in the third track 130. The slot 136 has teeth 138 disposed linearly along one side thereof and the shaft 134 has an end 140 carrying teeth.

The shaft 134 is journaled within the sleeve 118, and the end of the shaft 134 opposite the end 140 thereof is secured to a hand wheel or knob 142. Rotation of the knob 142 thereby translates the track 130 relative to the disc 122.

A fourth slide 144 is mounted on the third track 130 by means of bolts 146 which extend from the slot 136 in the third track 130, as best illustrated in FIGURE 5. The fourth slide 144 has a pair of anges 148 on opposite sides thereof which engage a fourth track 150. The fourth track 150 has a pair of walls 152 and 154 which carry plates 156 and 158 for engaging the flanges 148 of the fourth slide 144. The axis of the fourth slide 144, that is the direction of translation thereof, is normal to the direction of translation of the third slide 124.

on the disc 122. The position of these vernier adjusting devices 190 and 192 are illustrated in FIGURES 1, 2 and 4, and the construction of the Vernier adjusting devices 190 and 192 is best illustrated in FIGURES 5 and 6. Each of these devices has a flat base 194 which is mounted on the upper surface of the disc 122 by means of a screw 196 which extends through the neck 178 of the circular slot 174 and threadedly engages a bolt 198 disposed within the inner portion 176 of the circular slot 174. A vertical wall 200 extends from the base 194, and a bolt 202 is threaded into and through the wall 200. A knob 204 is disposed on the end of the bolt 202 opposite the arm 172, and the bolt 202 is adjusted against the arm 172 to rotate the disc 122. One of the Vernier adjusting devices 190 abuts one side of the arm 172, while the other Vernier adjusting device 192 abuts the opposite side of the arm 172. Each rotation of the knob 204 is effective to rotate the disc 122 through an angle of one degree of arc in the particular construction described throughout this specification.

Each of the four tracks and slides thus far described may also be positioned precisely to a given point along their translation axis. As best illustrated in FIGURE 1, the fourth slide 144 carries a U-shaped guide 206 which is secured thereon and travels with the fourth slide 144. The guide 206 has a pair of confronting legs 208 and 210 which have confronting parallel spaced surfaces which are normal to the axis of translation of the fourth slide 144 within the fourth track 150. The fourth track also carries a pin 212 which extends outwardly therefrom perpendicular to the axis of translation of the fourth slide 144 in the fourth track 150 and is disposed between the legs 208 and 210. The pin 212 will abut the legs 268 and 210 which form stops therefor. When the pin 212 is exactly midway between the legs 208 and 210, the cutter 52 is disposed on a plane which centrally traverses the slide 124 and track 130. Precise deviations from this plane may be achieved by positioning a machined and measured gage block 214 between either of the legs 208 and 210 and the pin 212. The block 214 may be one of a set of blocks of different dimensions, thereby selection of the block from the set will determine the distance from the central plane of translation of the slide 124 and track 130.

The third slide 124 also carries a guide 216, as illustrated in FIGURE l, and a pin 218 extends perpendicularly from the third track 13d. The pin 21S is disposed between legs of the slide 216, which is identical with the slide 266, to form stops for translation of the slide 124 within the track 130. When the pin 218 is disposed midway between the legs of the guide 216, the cutter 52 is disposed in a plane traversing the slide 124 normally and coincident with the axis of the shaft 134. The position of the third slide 124 relative to the third track 130 is set by means of spacer blocks 214 in the manner described above.

A guide 226 is also mounted on the second slide 64, and the guide 226 has a pair of legs 222 and 224 which extend therefrom normal to the axis of translation of the second slide 64 in the second track 62, and the second track 62 carries a pin 226 disposed between the legs 222 and 224. When the pin 226 is disposed midway between the legs 222 and 224, the axis of the shaft 134 is disposed on the central plane of the wheel 12 of the grinder 10. Spacer blocks 214 may be used in the manner set forth above to vary the position of the axis of the shaft 134 relative to the central plane of the wheel 12 of the grinder 10. A guide 223 is mounted on the first slide 6d, as illustrated in FIGURES l and 3, and has a pair of vertical legs 236 and 232 which extend downwardly therefrom. A pin 234 is disposed between the legs 236 and 232 and is mounted on the first track 58. Measured blocks 214 may be placed on either side of the pin 234 in abutment with one of the legs 236 or 232 to accurately position the first track 58 and first slide 60. If the block 214 is disposed between the leg 232 and the pin 234, the wheel 80 may be rotated to clamp the block 214 in this position. A screw 236 extends from the first track 58 parallel to the axis of translation of the first track 58 and first slide 60, and carries a nut 238. An angle bracket 240 mounted on the first slide 64D has a wall portion 242 disposed normal t0 the axis of translation of the first track 58 and first slide 60, and the bolt 236 is slidably disposed within an aperture 244 therethrough. The nut 23S rnay be tightened on the wall 242 of the bracket 240 to limit translation of the first track 58 relative to the first slide 60, and hence the depth of cut in the wheel 12 of the grinder permitted the cutter S2.

It will be apparent to those skilled in the art that the surface 14 of the wheel 12 may be provided with the geometric shapes possible with a geometric curve generator and these shapes be controlled to the desired depth by the apparatus set forth hereinabove. As stated above, a template guide may also be used with the wheel dresser of the present invention. The support member 34 carries a fifth track 246 between the quill 24 and the surface 66, and the fifth track 246 slidably controls the position of a fifth slide 248 in a horizontal plane, as best illustrated in FIGURE 3. The fifth track 246 has a pair of parallel horizontal walls 250 and 252 which terminate in plates 254 and 256 which lock outwardly extending flanges 258 of the fifth slide 24S in slidable position. The fifth slide 243 has a horizontal slot 26) which is provided with a linear row of teeth 262, and the row of teeth 262 engage teeth 264 on one end of a shaft 266. The shaft 266 is journaled in an aperturs 26S which extends through the support member 34 perpendicular to the plane of the wheel 12, and a wheel 271i is mounted on the end of the shaft 266 opposite the teeth 264.

The fifth slide 24S is translatable relative to the support member 34 along a horizontal axis perpendicular to the shaft 13. As illustrated in FIGURES l and 8, the fifth slide 248 carries a slot 272 and a T-shaped rod 274 is disposed within the slot 272. A pair of mounting strips 276 and 273 are secured on the fifth slide 248 by means of bolts 286, and a rod-shaped template support 282 extends horizontally from the rod 274. The rod-shaped template support 282 has an elongated slot 234 parallel to its axis confronting the shaft 54 which carries the cutter 52, and the template 286 is anchored within the slot 284. A stylus 28S is mounted on the shaft 54 confronting the template 286, and the stylus 288 may be made to follow the template by manipulation of the feed control wheel Sti and the lateral control wheel 106.

A bolt 290 provided with a nut 292 extends from the fifth track 246 parallel to the `axis of translation of the fifth tract and fifth slide. The fifth slide 248 carries a bracket 294 at its end with a wall portion 296 disposed normal to the bolt 290. A vertical pin 298 extends extends above and is mounted on the fifth slide 248, and a confronting pin 300 extends normally from the plate 254 of the fifth track 256. By rotation of the wheel 270, the pins 298 and 301) may be made to abut, or may be made to separate by a measured distance by positioning a block 214 between these pins. Further, the position of the template 286 may be limited in a direction approaching the the surface 14 of the wheel 12 by tightening the nut 292 against the wall 296 of the bracket 294.

FIGURE 10 is a diagramatic view -showing the range of movement of the shaft or spindle 54 which is afforded by the first track 5S and first slide 60, the second track 62 and second slide 64, the third slide 124 and third track 130, and the fourth slide 144 and the fourth track 156. FIGURE 10 shows the positions of the guides viewed from a plan attitude showing in solid line the minimum position of each of the guides and in dotted line the maximum position thereof. The guide 228 is illustrated with lits ieg 232 in abutment with the pin 234, or in its position at A; likewise, the guide 220 is indicated with its leg 222 in abutment with the pin 226 at B for its minimum position. The guide 206 is shown at position C with its leg 2113 abutting the pin 212. Also, the guide 216 is shown with one of tits legs abutting the pin y218, or in position D. When the guides 228, 220, 206, and 216 are in their respective positon designated by the letters A, B, C and D, the spindle or shaft 54 is in the position E, but the position E is free to travel in the arc F by rotation of theA wheel 120.

If the guide 223 is translated from the position A to the position A indicated in dotted line, and the guide 220 is translated from the position B to the position B', and the guide 266 is translated from the position C to the position C', and the guide 216 is translated from the position D to the position D', then the spindle or shaft 54 may assume one of the positions E in the are F. FIGURE l0, thus shows the area over which the spindle or shaft 54 may be freely translated.

FIGURE 9 illustrates a vertical (rat tail) diamond or cutter 302 mounted on a spindle 304 and a bracket 306. The bracket 366 is mounted on the shaft 54. This vertical diamond 362 may be utilized to inscribe small radii, and the like, where the cutter 52 might be considered too large or incapable of inscribing the desired contour.

The surface wheel dresser described above is clearly capable of dressing the surface 14 of the wheel 12 in any geometric pattern which may be generated by the geometric curve generator 56, or dressing the surface 14 by any pattern inscribed upon the template 286. Further, the surface wheel dresser need never be removed from the grinder 10, thereby making it unnecessary to realign the dresser on the grinder 10 each time the wheel is to be redressed. Further, the abrasive of the grinder will not injure the accuracy with which the dresser may be adjusted, since the measurement for adjustment is by means of the blocks 214, and these blocks 214 are removed from the surface dresser when not in actual use.

Those skilled in the art will devise many modifications to the surface wheel dresser and grinder set forth in this disclosure, and the present invention will be recognized to have advantages over and above those specifically set forth. It is therefore intended that the scope of the presslide thereon between the legs ent invention be not limited by the foregoing disclosure, but rather only by the appended claims.

The invention claimed is:

1. A surface dresser adapted to shape the surface of an abrasive wheel of a grinder comprising a support member adapted to be mounted on the grinder, said support member defining a first track having an axis of elongation normal to a first plane traversing an axis parallel to the rotational axis of the wheel, said support member also defining a second track having an axis of elongation parallel to the first track, a first slide slidably disposed in the first track, a second slide slidably disposed in the second track, means for controlling the position of the first slide in the first track, means for controlling the position of the second slide in the second track, a third track mounted on the first slide having an axis ofrelongation parallel to the rotational axis of the wheel, a third slide slidably disposed on the third track, means for controlling the position of the third slide on the third track, a geometric curve generator having a control member and a shaft extending therefrom normal to the translational axis of the third slide, actuation of the control member translating the shaft in an arc, a cutter mounted on the shaft adapted to engage the peripheral surface of the wheel, means for mounting a template on the second slide having a control edge oriented with respect to an axis disposed normal to the translational axis of the second slide, and a stylus mounted on the shaft adapted to engage the control edge of the template.

2. A surface dresser and grinder comprising the elements of claim 1 in combination with a wheel grinder having a frame with a protruding hub and a cylindrical channel extending through the hub, an axle rotatably disposed in the channel and a grinding wheel mounted on the axle adjacent to the hub, the support member of the wheel dresser having a bifurcated portion defining an opening with the contour of the exterior surface of the hub and a slot extending into the opening, said bifurcated portion being disposed about the hub for mounting the surface dresser on the wheel grinder, and means for drawing the bifurcated portion together.

3. A surface dresser adapted to shape the surface of an abrasive wheel of a grinder comprising the elements of claim l wherein the geometric curve generator comprises a hub mounted on the third slide having a channel extending therethrough on an axis normal to the translational axis of the third slide, a sleeve rotatably disposed within the hub, a control wheel mounted on the sleeve on the side of the hub remote from the cutting head, a disc coaxially mounted on the sleeve on the side of the hub opposite the wheel, a fourth track mounted on the side of the disc remote from ythe wheel and traversing the central axis of the disc, a fourth slide slidably mounted on the fourth track, means for controlling the translational position of the fourth slide on the fourth track, the shaft being mounted on the fourth slide and disposed parallel to the sleeve.

4. A surface dresser comprising the elements of claim 3 in combination with a fifth track mounted on the fourth slide having an axis of elongation normal to the fourth track, and a fifth slide mounted on the fifth track, the shaft being mounted on the fifth slide.

5. A surface dresser adapted to shape the surface of an abrasive Wheel of a grinder comprising the elements of claim 1 wherein each slide is provided with a guide secured thereon having a pair of spaced legs extending from the guide normal to the axis of translation of said slide relative to the track thereof, a pin mounted on each track extending normal to the translational axis of the of the guide thereon, whereby each slide may be positioned relative to the track thereof by a spacing block positioned between the pin of said track and either leg of the guide of said slide.

6. A surface dresser comprising the elements of claim 1 wherein each track is provided with an elongated linear slot parallel to the translational axis of the slide thereof, said slot having a linear row of teeth extending therein from one side thereof, each slide having a stem extending normally from the slot in the track confronting said slide, `a shaft rotatably journaled in the stem of each slide having a cylindrical portion confronting the linear row of teeth of the slot and mating teeth extending outwardly therefrom, and a knob mounted on each shaft.

7. A surface dresser adapted to shape the surface of an abrasive wheel of a grinder comprising the elements of claim 3 wherein the hub is provided with an Iarm extending outwardly therefrom to the periphery of the disc, said arm having a marker line thereon normal to the disc, and the periphery of said disc having a plurality of spaced marker lines thereon parallel to the marker line on the arm.

8. A surface dresser vadapted to shape the surface of an abrasive wheel of a grinder comprising the elements of claim 7 wherein the disc is provided with a pair of spaced stops, said stops confronting opposite sides of the arm of the hub, and the stops being adjustable about the perimeter of the disc.

9. A surface dresser adapted to shape the surface of an -abrasive wheel of a grinder comprising the elements of claim 1 wherein the geometric curve generator comprises a hub having a channel extending therethrough, a sleeve rotatably disposed within the hub, a control wheel mounted on the sleeve on one side of the hub, a disc coaxially mounted on the sleeve on the side of the hub opposite the wheel, a track mounted on the side of the disc opposite the hub traversing the center of said disc, said track having an opening therein aligned therewith the axis of the sleeve, a slide slidably mounted on the track having a linear slot extending therein confronting the opening in the track, said slot having a row of teeth extending inwardly therefrom, a shaft rotatably disposed within the sleeve and the opening in the track, said shaft having a plurality of teeth thereon engaging the teeth on the row of teeth of the slide, a second track securely mounted on the slide having an axis of elongation normal to the translation axis of the slide, a second slide mounted on the second track, said second slide having a linear slot therein confronting the second track and a channel extending therein normal to said slot, a member having a row of teeth thereon disposed in the slot of the second slide and mounted thereon the second track, a second shaft rotatably mounted in the channel of the second slide and having a plurality of spaced teeth extending outwardly from a cylindrical plane engaging the teeth of the member, a knob disposed on the end of the second shaft remote from the teeth thereof, a wheel mounted on the end of the sleeve remote from the disc, and a second knob mounted on the end of the first shaft remote from the teeth thereof, whereby the hub may be mounted to a support structure and the position of the second slide utilized to inscribe geometrie curves.

References Cited in the file of this patent UNITED STATES PATENTS 1,750,175 Holmes Mar. 11, 1930 1,994,386 Dardeni Mar. 12, 1935 2,117,979 Ogilvie May 17, 1938 2,160,365 Larsson May 30, 1939 2,336,758 Statia Dec. 14, 1943 2,849,840 Stoeckel Sept. 2, 1958 3,028,853 Miller Apr. 10, 1962 FOREIGN PATENTS 1,078,284 France May 5, 1954 

1. A SURFACE DRESSER ADAPTED TO SHAPE THE SURFACE OF AN ABRASIVE WHEEL OF A GRINDER COMPRISING A SUPPORT MEMBER ADAPTED TO BE MOUNTED ON THE GRINDER, SAID SUPPORT MEMBER DEFINING A FIRST TRACK HAVING AN AXIS OF ELONGATION NORMAL TO A FIRST PLANE TRAVERSING AN AXIS PARALLEL TO THE ROTATIONAL AXIS OF THE WHEEL, SAID SUPPORT MEMBER ALSO DEFINING A SECOND TRACK HAVING AN AXIS OF ELONGATION PARALLEL TO THE FIRST TRACK, A FIRST SLIDE SLIDABLY DISPOSED IN THE FIRST TRACK, A SECOND SLIDE SLIDABLY DISPOSED IN THE SECOND TRACK, MEANS FOR CONTROLLING THE POSITION OF THE FIRST SLIDE IN SECOND SLIDE IN THE SECOND TRACK, A THIRD TRACK MOUNTED ON THE FIRST SLIDE HAVING AN AXIS OF ELONGATION PARALLEL TO THE ROTATIONAL AXIS OF THE WHEEL, A THIRD SLIDE SLIDABLY DISPOSED ON THE THIRD TRACK, MEANS FOR CONTROLLING THE POSITION OF THE THIRD SLIDE ON THE THIRD TRACK, A GEOMETRIC CURVE GENERATOR HAVING A CONTROL MEMBER AND A SHAFT EXTENDING THEREFROM NORMAL TO THE TRANSLATIONAL AXIS OF THE THIRD SLIDE, ACTUATION OF THE CONTROL MEMBER TRANSLATING THE SHAFT IN AN ARC, A CUTTER MOUNTED ON THE SHAFT ADAPTED TO ENGAGE THE PERIPHERAL SURFACE OF THE WHEEL, MEANS FOR MOUNTING A TEMPLATE ON THE SECOND SLIDE HAVING A CONTROL EDGE ORIENTED WITH RESPECT TO AN AXIS DISPOSED NORMAL TO THE TRANSLATIONAL AXIS OF THE SECOND SLIDE, AND A STYLUS MOUNTED ON THE SHAFT ADAPTED TO ENGAGE THE CONTROL EDGE OF THE TEMPLATE. 